Mask and LED module

1 . An LED module comprising a substrate, a plurality of LED emitting units, a mask and a polarizer, the plurality of LED emitting units being provided at a side of the substrate, the mask being integrally in a grid structure and comprising a plurality of grid units mounted around the plurality of LED emitting units, respectively, each of the plurality of grid units being enclosed by a retaining wall, one end of the retaining wall away from the substrate extending outwards along a direction close to a center of the grid unit to form a support edge, an outer side of the support edge being provided with a support plane;

the polarizer comprising first circular polarizers, second circular polarizers and a third polarizer, the third polarizer being a reflective polarizer with a reflective surface thereof facing towards the plurality of LED emitting units, a portion of a side of the reflective polarizer that is away from the plurality of LED emitting units corresponding to each of the plurality of LED emitting units being individually provided with the first circular polarizer or the second circular polarizer, wherein the third polarizer is configured to perform polarization reflection on light emitted by the LED emitting units;

the first circular polarizers and the second circular polarizers being circular polarizers and being opposite in polarization directions, wherein the light emitted by the LED emitting units is transmitted through the third polarizer, is then incident on the first circular polarizers or the second circular polarizers, and is converted into left circularly polarized light or right circularly polarized light by the first circular polarizers or the second circular polarizers.

2 . The LED module according to claim 1 , wherein the first circular polarizers and the second circular polarizers are attached onto the reflective polarizer.

3 . The LED module according to claim 2 , wherein the first circular polarizers and the second circular polarizers are alternately arranged in first and second directions, and the first direction is perpendicular to the second direction; or

wherein the first circular polarizers are continuously arranged in a first direction, the second circular polarizers are continuously arranged in the first direction, and the first circular polarizers and the second circular polarizers are alternately arranged in a second direction.

4 . The LED module according to claim 1 , wherein each of the first circular polarizers is neighboring to at least one of the second circular polarizers, and each of the second circular polarizers is neighboring to at least one of the first circular polarizers.

5 . The LED module according to claim 1 , wherein the plurality of grid units comprises multiple rows of grid units, the first polarizers and the second polarizers are strip-shaped, a portion of the third polarizer corresponding to the grid units in a same row is attached with the first circular polarizer or the second circular polarizer, and the first circular polarizers and the second circular polarizers are alternately arranged in a width direction.

6 . The LED module according to claim 1 , wherein the support plane is a flat support plane, and the third polarizer is attached onto the support plane; or

wherein an inner face of the grid unit or a side of the substrate on which the LED emitting units are arranged is a reflective surface,

and the light emitted by the LED emitting units is reflected again by the reflective surface of the grid unit or the substrate after being reflected by the third polarizer;

wherein the support planes at outer sides of the support edges of the plurality of grid units are located in a same plane; or wherein the supporting edge of each of the plurality of grid units is an annular structure; or wherein a cross-section of the grid unit is square-shaped;

wherein a projection area of the support edge of each grid unit is less than 20% of an area of the corresponding grid unit;

wherein an inner face of the retaining wall is provided with reinforced ribs connected to the support edge, the reinforced ribs are arranged along a periphery of an opening side of the retaining wall adjacent to the support edge and spaced from each other, and the reinforced ribs are perpendicular to the inner face of the retaining wall; and

wherein when the retaining wall and the support edge are formed separately, the reinforcing ribs abut against an inner side of the support edge; and when the retaining wall and the support edge are formed integrally, the reinforcing ribs are connected to the support edge integrally.